How do you solve the equation all four equations are 1 problem. i have to solve for w, x, y and z
x + y + z - w= 4
2x + y - z + w =3
x - 5y + 2z +w = -4
-x -y + z + 3w = 2
Ecodani is right on. Another method to use is linear algebra by building a matrix.
http://answers.yahoo.com/question/index?qid=20100418015604AAYNtxS
Write your equations this way, and solve for the diagonal (underlined).
1 1 1 -1 4
2 1 -1 1 3
1 -5 2 1 -4
-1 -1 1 3 2
Add/subtract rows from each other till the only values >0 left are those on the diagonal (x,y,z,w) and last column (value).
My solution: x=-7, y=14, z=21 2/3 and w=24 2/3
Answer by anng.atlanta at 12:58 AM on Sep. 14, 2010
Answer by ecodani at 11:48 PM on Sep. 13, 2010
Answer by rAbella at 11:47 PM on Sep. 13, 2010
Answer by sstepph at 7:00 AM on Sep. 14, 2010
Answer by steveiguana at 7:23 AM on Sep. 14, 2010
Answer by KTMOM at 8:34 AM on Sep. 14, 2010
Answer by NicolesMommy at 12:14 AM on Sep. 15, 2010
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